61043661 has 36 divisors (see below), whose sum is σ = 103369500. Its totient is φ = 34610688.

The previous prime is 61043627. The next prime is 61043669. The reversal of 61043661 is 16634016.

61043661 is a `hidden beast` number, since 610 + 43 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3572100 + 57471561 = 1890^2 + 7581^2 .

It is not a de Polignac number, because 61043661 - 2⁹ = 61043149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61043669) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65245 + ... + 66173.

It is an arithmetic number, because the mean of its divisors is an integer number (2871375).

Almost surely, 2^61043661 is an apocalyptic number.

It is an amenable number.

61043661 is a deficient number, since it is larger than the sum of its proper divisors (42325839).

61043661 is a wasteful number, since it uses less digits than its factorization.

61043661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61043661 is about 7813.0442850402. The cubic root of 61043661 is about 393.7436147113.

Adding to 61043661 its reverse (16634016), we get a palindrome (77677677).

The spelling of 61043661 in words is "sixty-one million, forty-three thousand, six hundred sixty-one".